geotiff.js/src/utils.js

GeoTIFF image decoding in JavaScript

export function assign(target, source) {
  for (const key in source) {
    if (source.hasOwnProperty(key)) {
      target[key] = source[key];
    }
  }
}

export function chunk(iterable, length) {
  const results = [];
  const lengthOfIterable = iterable.length;
  for (let i = 0; i < lengthOfIterable; i += length) {
    const chunked = [];
    for (let ci = i; ci < i + length; ci++) {
      chunked.push(iterable[ci]);
    }
    results.push(chunked);
  }
  return results;
}

export function endsWith(string, expectedEnding) {
  if (string.length < expectedEnding.length) {
    return false;
  }
  const actualEnding = string.substr(string.length - expectedEnding.length);
  return actualEnding === expectedEnding;
}

export function forEach(iterable, func) {
  const { length } = iterable;
  for (let i = 0; i < length; i++) {
    func(iterable[i], i);
  }
}

export function invert(oldObj) {
  const newObj = {};
  for (const key in oldObj) {
    if (oldObj.hasOwnProperty(key)) {
      const value = oldObj[key];
      newObj[value] = key;
    }
  }
  return newObj;
}

export function range(n) {
  const results = [];
  for (let i = 0; i < n; i++) {
    results.push(i);
  }
  return results;
}

export function times(numTimes, func) {
  const results = [];
  for (let i = 0; i < numTimes; i++) {
    results.push(func(i));
  }
  return results;
}

export function toArray(iterable) {
  const results = [];
  const { length } = iterable;
  for (let i = 0; i < length; i++) {
    results.push(iterable[i]);
  }
  return results;
}

export function toArrayRecursively(input) {
  if (input.length) {
    return toArray(input).map(toArrayRecursively);
  }
  return input;
}